Want to ski and ride some of the steepest, least-crowded (and most sublime) inbounds terrain anywhere? Skip the lifts (and the lines) and follow this insider’s guide to 80+ hike-to trails at Summit’s signature resorts.

These two local human endurance gurus—one, a three-time Olympian who trained Kikkan Randall, the other who coaches the US Ski Mountaineering Team—share a singular goal: minting the fastest mountain athletes on the planet.